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Dow Rockets. Volumes Plummet.

The timing couldn’t have been more apposite: the Dow Jones Industrial Average breached 17,000 for the first time just ahead of the July 4th weekend.

But this landmark didn’t quite trigger fireworks. Investors are becoming used to this key U.S. equity market barometer setting record highs–it’s been doing so steadily since the first quarter of 2013. What’s more, the highs have been hit on steadily shrinking trading volumes.